Bug 1267943

Summary:	[RFE][cinder] Generic image cache functionality
Product:	Red Hat OpenStack	Reporter:	Sean Cohen <scohen>
Component:	openstack-cinder	Assignee:	Eric Harney <eharney>
Status:	CLOSED ERRATA	QA Contact:	lkuchlan <lkuchlan>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ddomingo, eharney, jschluet, sgotliv, yeylon
Target Milestone:	beta	Keywords:	FutureFeature, OtherQA
Target Release:	8.0 (Liberty)
Hardware:	Unspecified
OS:	Unspecified
URL:	https://blueprints.launchpad.net/cinder/+spec/image-volume-cache
Whiteboard:
Fixed In Version:	openstack-cinder-7.0.0-2.el7ost	Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:
Clones:	1297249 (view as bug list)		Environment:
Last Closed:	2016-04-07 21:10:09 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1297249

Description Sean Cohen 2015-10-01 12:36:19 UTC

This introduces a new feature for backends to be able to use cached
glance images when creating volumes from images.

If enabled, and the cinder internal tenant is configured, it will
create a minimal sized clone of a volume the first time it is
downloaded from glance. A new db table ‘image_volume_cache’ tracks
these volumes, which are owned by the Cinder internal tenant. The
original will then be extended to full size. Any subsequent requests to
create a volume from an image will be able to do a volume clone from
the image-volume cache entry instead of downloading the image data from
glance again.

Comment 4 lkuchlan 2016-02-03 08:52:08 UTC

Tested using:
python-cinder-7.0.1-5.el7ost.noarch
openstack-cinder-7.0.1-5.el7ost.noarch
python-cinderclient-1.4.0-1.el7ost.noarch

[stack@instack ~]$ cinder create 1 --image 18234a00-1493-44b6-b6aa-5d78a500a752

From cinder db:

MariaDB [cinder]> select * from image_volume_cache_entries;
+---------------------+----+---------------------------------------------------------+--------------------------------------+--------------------------------------+------+---------------------+
| image_updated_at    | id | host                                                    | image_id                             | volume_id                            | size | last_used           |
+---------------------+----+---------------------------------------------------------+--------------------------------------+--------------------------------------+------+---------------------+
| 2016-01-27 20:45:08 |  1 | overcloud-controller-0.localdomain@Netapp1#vol_rhos_nfs | 2bc9560b-6e7c-4614-a332-3f263ed5fdc8 | c75409d8-dea2-401f-996e-e13cd6c98747 |    1 | 2016-02-03 08:43:27 |
+---------------------+----+---------------------------------------------------------+--------------------------------------+--------------------------------------+------+-------------------

Comment 6 errata-xmlrpc 2016-04-07 21:10:09 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHEA-2016-0603.html